Share-based Compensation (Inputs Used for Valuation of Option Grants under Stock Option Plans) (Details) - shares shares in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Expected volatility	29.50%
Weighted-average volatility	29.50%
Expected dividends	2.95%
Risk-free rate	1.50%
Average risk-free rate	1.50%
Expected term (in years)	7 years 4 months 24 days
Pre-vesting executive departure rate	0.60%
Granted, number of shares (in shares)		10,653
Minimum [Member]
Expected volatility		32.90%	29.50%
Weighted-average volatility		32.90%	29.50%
Expected dividends		4.48%	2.36%
Risk-free rate		0.50%	1.50%
Average risk-free rate		0.50%	1.50%
Expected term (in years)		7 years 4 months 24 days	7 years 4 months 24 days
Pre-vesting executive departure rate		0.60%	0.60%
Pre-vesting non-executive departure rate		2.50%
Maximum [Member]
Expected volatility		32.90%	29.90%
Weighted-average volatility		32.90%	29.90%
Expected dividends		4.48%	2.95%
Risk-free rate		0.50%	2.40%
Average risk-free rate		0.50%	2.40%
Expected term (in years)		7 years 4 months 24 days	7 years 4 months 24 days
Pre-vesting executive departure rate		0.60%	0.60%
Pre-vesting non-executive departure rate		2.50%